Gunfire from Syria hits camp in Turkey, wounding 5

In this citizen journalism image provided by the Local Coordination Committees in Syria taken on Sunday, April 8, 2012, A Syrian man holding a microphone attends a demonstration in Damascus, Syria. A leading international human rights group says Syrian forces have summarily executed several people, most of them civilians. Monday's report by Human Rights Watch says this includes several mass executions in the restive provinces of Homs and Idlib. Arabic writing on the wall reads, "Happy Easter." (AP Photo/Local Coordination Committees in Syria) THE ASSOCIATED PRESS IS UNABLE TO INDEPENDENTLY VERIFY THE AUTHENTICITY, CONTENT, LOCATION OR DATE OF THIS HANDOUT PHOTO
— AP

In this citizen journalism image provided by the Local Coordination Committees in Syria taken on Sunday, April 8, 2012, A Syrian man holding a microphone attends a demonstration in Damascus, Syria. A leading international human rights group says Syrian forces have summarily executed several people, most of them civilians. Monday's report by Human Rights Watch says this includes several mass executions in the restive provinces of Homs and Idlib. Arabic writing on the wall reads, "Happy Easter." (AP Photo/Local Coordination Committees in Syria) THE ASSOCIATED PRESS IS UNABLE TO INDEPENDENTLY VERIFY THE AUTHENTICITY, CONTENT, LOCATION OR DATE OF THIS HANDOUT PHOTO
/ AP

In this Friday, April 6, 2012 photo, Free Syrian Army fighters gather on a corner during fighting with Syrian troops in a suburb of Damascus, Syria. Syrian government shelling and offensives against rebel-held towns killed dozens of people across the country on Saturday, activists said, as the U.S. posted online satellite images of troop deployments that cast further doubt on whether the regime intends to comply with an internationally sponsored peace plan. (AP Photo)— AP

In this Friday, April 6, 2012 photo, Free Syrian Army fighters gather on a corner during fighting with Syrian troops in a suburb of Damascus, Syria. Syrian government shelling and offensives against rebel-held towns killed dozens of people across the country on Saturday, activists said, as the U.S. posted online satellite images of troop deployments that cast further doubt on whether the regime intends to comply with an internationally sponsored peace plan. (AP Photo)
/ AP

In this citizen journalism image provided by the Local Coordination Committees in Syria and taken on Saturday, April 7, 2012, Syrians chant slogans and wave Syrian revolutionary flags during a demonstration in Daraa, Syria. A U.N.-brokered peace deal for Syria appeared to collapse Sunday April 8, 2012 as the government made a new demand that its opponents provide "written guarantees" to lay down their weapons before regime forces withdraw from cities, a call swiftly rejected by the country's main rebel group. (AP Photo/Local Coordination Committees in Syria) THE ASSOCIATED PRESS IS UNABLE TO INDEPENDENTLY VERIFY THE AUTHENTICITY, CONTENT, LOCATION OR DATE OF THIS HANDOUT PHOTO— AP

In this citizen journalism image provided by the Local Coordination Committees in Syria and taken on Saturday, April 7, 2012, Syrians chant slogans and wave Syrian revolutionary flags during a demonstration in Daraa, Syria. A U.N.-brokered peace deal for Syria appeared to collapse Sunday April 8, 2012 as the government made a new demand that its opponents provide "written guarantees" to lay down their weapons before regime forces withdraw from cities, a call swiftly rejected by the country's main rebel group. (AP Photo/Local Coordination Committees in Syria) THE ASSOCIATED PRESS IS UNABLE TO INDEPENDENTLY VERIFY THE AUTHENTICITY, CONTENT, LOCATION OR DATE OF THIS HANDOUT PHOTO
/ AP

In this citizen journalism image provided by the Local Coordination Committees in Syria and taken on Friday, April 6, 2012, Syrians chant slogans during a demonstration in Idlib, north Syria. A U.N.-brokered peace deal for Syria appeared to collapse Sunday April 8,2012 as the government made a new demand that its opponents provide "written guarantees" to lay down their weapons before regime forces withdraw from cities, a call swiftly rejected by the country's main rebel group. The flags on the children's shirt are Syrian revolutionary flags. (AP Photo/Local Coordination Committees in Syria) THE ASSOCIATED PRESS IS UNABLE TO INDEPENDENTLY VERIFY THE AUTHENTICITY, CONTENT, LOCATION OR DATE OF THIS HANDOUT PHOTO— AP

In this citizen journalism image provided by the Local Coordination Committees in Syria and taken on Friday, April 6, 2012, Syrians chant slogans during a demonstration in Idlib, north Syria. A U.N.-brokered peace deal for Syria appeared to collapse Sunday April 8,2012 as the government made a new demand that its opponents provide "written guarantees" to lay down their weapons before regime forces withdraw from cities, a call swiftly rejected by the country's main rebel group. The flags on the children's shirt are Syrian revolutionary flags. (AP Photo/Local Coordination Committees in Syria) THE ASSOCIATED PRESS IS UNABLE TO INDEPENDENTLY VERIFY THE AUTHENTICITY, CONTENT, LOCATION OR DATE OF THIS HANDOUT PHOTO
/ AP

In this citizen journalism image provided by the Local Coordination Committees in Syria and taken on Friday, April 6, 2012, Syrians chant slogans during a demonstration in Idlib, north Syria. A U.N.-brokered peace deal for Syria appeared to collapse Sunday April 8, 2012 as the government made a new demand that its opponents provide "written guarantees" to lay down their weapons before regime forces withdraw from cities, a call swiftly rejected by the country's main rebel group. The banner with the Syrian revolutionary flag on it and Arabic writing reads, "dignity revolution in Syria." (AP Photo/Local Coordination Committees in Syria) THE ASSOCIATED PRESS IS UNABLE TO INDEPENDENTLY VERIFY THE AUTHENTICITY, CONTENT, LOCATION OR DATE OF THIS HANDOUT PHOTO— AP

In this citizen journalism image provided by the Local Coordination Committees in Syria and taken on Friday, April 6, 2012, Syrians chant slogans during a demonstration in Idlib, north Syria. A U.N.-brokered peace deal for Syria appeared to collapse Sunday April 8, 2012 as the government made a new demand that its opponents provide "written guarantees" to lay down their weapons before regime forces withdraw from cities, a call swiftly rejected by the country's main rebel group. The banner with the Syrian revolutionary flag on it and Arabic writing reads, "dignity revolution in Syria." (AP Photo/Local Coordination Committees in Syria) THE ASSOCIATED PRESS IS UNABLE TO INDEPENDENTLY VERIFY THE AUTHENTICITY, CONTENT, LOCATION OR DATE OF THIS HANDOUT PHOTO
/ AP

Syrian forces fired across the border Monday into a refugee camp in Turkey, wounding at least five people as a U.N.-brokered plan to end more than a year of violence this week all but collapsed, authorities said.

Syrian activists said two people were killed, but the reports could not be immediately confirmed.

The Syrian soldiers were believed to be firing at rebels who tried to escape to the refugee camp after attacking a military checkpoint, according to the Britain-based Syrian Observatory for Human Rights, citing a network of sources on the ground.

Turkey shelters thousands of refugees who have fled Syria as the government tries to crush a revolt against President Bashar Assad. The U.N. estimates some 9,000 people have been killed in Syria since March 2011, when the uprising began.

Monday's shooting bolstered fears that the uprising could spark a broad conflagration by sucking in neighboring countries. There have been similar cross-border attacks into Lebanon, although Monday's shooting was believed to be the first inside Turkey.

The incident began at about before dawn on Monday when rebel fighters attacked Syrian soldiers manning a checkpoint near the Turkish border, said Rami Abdul-Rahman, a spokesman for the Observatory.

Six soldiers were killed in the ambush, Abdul-Rahman said. The troops then kept firing as eight wounded rebels escaped to the camp that is just over the border in Turkey, sending bullets whizzing across the frontier into the camp, he said.

According to the Observatory, the shooting wounded five people in the camp, which is near the town of Kilis in the southern province of Gaziantep. The Observatory reported that two people later died of their injuries, but that could not be immediately confirmed.

The governor of Gaziantep province, Yusuf Odabas, said five people were wounded: three Syrians, one Turkish translator and one Turkish policemen. The translator had entered the camp to try to help calm an anti-Assad protest, he said. The governor said Turkish military forces did not return fire.

Turkey hosts some 24,000 Syrian refugees, including hundreds of army defectors, and has floated the idea of setting up a buffer zone inside Syria if the flow of displaced people across its border becomes overwhelming.

Parts of the southern Turkish region near Syria are informal logistics bases for rebels, who collect food and other supplies in Turkey and deliver them to comrades inside Syria via smuggling routes.

The Syrian uprising began last year with mostly peaceful protests against the Assad regime, a family dynasty that has ruled the country for four decades. But in the face of a relentless military assault on protests, the opposition has become increasingly militarized.

Now, the uprising resembles an armed insurgency, and there are fears the country is spiraling toward civil war. International envoy Kofi Annan brokered a cease-fire that was supposed to begin Tuesday, but the plan is in tatters.

Syrian troops were meant to pull out of population centers by Tuesday morning, but the government on Sunday introduced a new demand - saying it cannot withdraw without written guarantees from opposition fighters that they will lay down their arms. Syria's main rebel group rejected the government's demands.